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My iPhone 6 screen is on the fritz, it has a mind of its own. It will randomly start scrolling and tapping really fast. It’s almost like there is moisture under the screen, but I know there isnt. This problem has gotten worse over time. Maybe just a dud screen? Has anyone else seen this and how can I fix it? I’d rather not replace the screen if I don’t have to

Is this still your original Apple screen or was it repaired/replaced? There are low quality screens on the market and it is possible that the replacement was not top quality. Ghost touching is a common problem with poor quality replacement screens. If it is still your original screen, it could be defective due to multiple drops over its lifetime. The only way to know is to replace it with a good quality or otherwise known-good screen. You can find a good screen here and the guide to replace it here.